Poster: The Use of Modified Rat Vascular Access ButtonsTM to Refine Repeat Blood Sample Collection in Miniature Pigs
Pigs share many physiological, anatomical, and metabolic similarities to humans making them a great model. Recently, there has been an increased demand to use miniature pigs as a non-rodent species for pharmacology and toxicology studies as part of pre-clinical drug safety testing. Typically, these tests require more than 8 blood collection time points over a 24 hour period and the same pig may be used to evaluate multiple dose levels or for multiple studies resulting in many blood collections per animal. Additional blood vessel access may also be required for test articles administered intravenously (IV).
Journal: Simultaneous Quantification Of Total Antibody And Antibody-Conjugated Drug For XMT-1522 In Human Plasma Using Immunocapture-Liquid Chromatography/Mass Spectrometry
XMT-1522, an antibody-drug conjugate (ADC) currently in Phase I clinical development, represents the first Dolaflexin®-based, cleavable ADC with a high drug-antibody ratio (DAR). In this work, a novel immunocapture LC–MS/MS method was successfully developed for the simultaneous quantification of both total antibody and cleavable antibody-conjugated drug auristatin F-hydroxypropylamide (AF-HPA) in human plasma. This method utilized microwave-assisted enzymatic digestion for the total antibody and chemical release of the drug from ADC on a 96-well based immunocapture sample preparation platform. The total antibody and the conjugated drug AF-HPA were separated and subsequently quantified concurrently by LC–MS/MS. The linear range of the standard curve for total antibody was from 50 to 5000 ng/mL and for AF-HPA was from 3.3 to 330 ng/mL. The linearities showed R2 ≥ 0.993 for total antibody and R2 ≥ 0.996 for AF-HPA, respectively. The intra- and inter-day precision and accuracy were well within 15%. The validated method, with the characteristics of high efficiency, great selectivity, free of carryover, short LC–MS/MS time (˜3.5 min) and low sample volume (20 μl), was successfully applied for analyzing Phase 1 cancer patient samples.
Fact Sheet: Bioanalytical Overview
Frontage Laboratories provides bioanalytical services to help support your full drug development. Our state-of-the-art equipment and experienced personnel will quickly and efficiently provide you with the data to support your programs. We provide the resources of a highly skilled, client- focused staff with extensive academic, scientific and pharmaceutical industry experience.
Poster: Pre-Existing Antibodies within Immunogenicity Testing
Monoclonal antibodies and next generation molecules such as antibody-drug conjugates (ADC) are being developed and moved into early phase clinical testing. These new molecules bring challenges for measuring immunogenicity within human serum samples.
• Therapeutic monoclonal antibodies could have structural regions which could contain ADA binding domains [Figure 1].
• ADC molecule has a mAb joined to a small drug by a linker region [Figure 2]. This may lead to a highly potent drug which is also a selective binder of a specific tumor antigen; however, the structure may also present a neoepitope to the immune system.
• Development of anti-drug antibody (ADA) assays to both mAb’s and ADC’s very commonly has demonstrated the presence of pre-existing antibodies (PEXA) in a small percentage of drug naïve normal human serum samples. It is currently unclear as to the evolutionary mechanism that has allowed PEXA to develop. Their presence may serve as a regulatory mechanism to suppress the immune system under certain conditions.
• Regardless of how pre-existing antibodies may have developed, measuring an anti-drug antibody (ADA) response in serum samples may present additional challenges with these pre-existing molecules present. Here, we outline a strategy to determine where on the molecule the ADA reactivity is directed against.
Fact Sheet: Bioanalytical Large Molecule
Gain access to comprehensive biologics services in support of advanced development programs with Frontage’s bioanalytical laboratory. We have the capabilities to analyze virtually any peptide, protein or antibody, and have built a reputation for solving technical challenges related to assay development and validation.